Contract 0xE0087Fe82Ff10f6a5B2ef0a074d91eacF3E2e9Da

/**
 *Submitted for verification at polygonscan.com on 2022-12-22
*/

/**
 *Submitted for verification at polygonscan.com on 2022-12-16
*/

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: contracts/LKFRewardWinners.sol

contract LKFRewardWinners is Ownable {

    uint public seed;
    uint nonce;

    address[] public users;

    address[] public memorabiliaMedalsWinners;
    address public basketballSignedWinner;
    address public tshirtSignedWinner;

    function addUsers(address[] memory _users) public onlyOwner {
        for(uint i = 0; i < _users.length; i++) {
            users.push(_users[i]);
        }
    }

    function setmemorabiliaMedalsWinners() public onlyOwner {
        require(memorabiliaMedalsWinners.length == 0, "already set");
        for(uint i = 0; i < 10; i ++) {
            nonce++;
            uint random = getRandom();

            uint winnerId = random % users.length;

            memorabiliaMedalsWinners.push(users[winnerId]);
        }  
    }

    function setBasketballSignedWinner() public onlyOwner {
        require(basketballSignedWinner == address(0), "already set");
        nonce++;
        uint random = getRandom();

        uint winnerId = random % users.length;

        basketballSignedWinner = users[winnerId];
    }

    function setTshirtSignedWinner() public onlyOwner {
        require(tshirtSignedWinner == address(0), "already set");
        nonce++;
        uint random = getRandom();

        uint winnerId = random % users.length;

        tshirtSignedWinner = users[winnerId];
    }

    function getRandom() public view returns (uint) {
        return uint(keccak256(abi.encodePacked(seed, nonce)));
    } 

    function setSeed() public onlyOwner {
        require(seed == 0, "seed already set");
        seed = uint(keccak256(abi.encodePacked(block.difficulty, block.timestamp)));
    } 
}

• No Contract Security Audit Submitted- Submit Audit Here

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ipfs://8159b71ab5efecd7d923c05b30590feeb4cec6542ac528f8cf5a49b9b68b3abd